Improvement in lamp-chimneys



A. ALBERTSON.

Lamp Chimney. N01 43,890. Patenaed Dec. 8, 1863.

4: M Y ww PATENT Trice.

ALBERT ALBERTSON,

OF NEW YORK, N. Y.

IMPROVEMENT IN LAMP-CHIMNEYS.

Specification forming part of Letters Patent No. 40,890, dated December8, 1863; ant-edated November 26, 1863.

To all whom it may concern:

Be it know that I, ALBERT ALBERTSON, of the city, county, and State ofNew York, have invented a new and Improved Lamp- Ghimney; andI do herebydeclare that the followingis a full, clear, and exact description of thesame, reference being had to the accompanying drawing, making a part ofthis specification, said drawing being a vertical central section of myinvention applied to a lamp.

This invention relates to an improved lampchimney of that class in whichglass and metal are combined, the lower part of the chimney being ofglass and the upper part of metal.

The invention consists in having the upper metal part of the chimneyconnected by rods or standards to a metal ring or base, the wholeforming a metal frame, on the exterior of which the glass portion of thechimney is fitted and arranged in such a manner as to be capable ofbeing raised and lowered so as to render the wick accessible forlighting and trimming without removing the chimney from the burner, theglass portion of the chimney at the same time being allowed to expandfreely under the heat of the flame without the liability of fracturefrom that cause.

To enable those skilled in the art to fully understand and construct myinvention, I will proceed to describe it.

A represents the fountain or body of a lamp, which may be constructed inany of the known forms, and B is the burner of the lamp, the kind mostgenerally employed for coal-oil lamps. These parts being of ordinaryconstruction do not require a minute description.

0 represents the chimney of the lamp, which is composed of metal andglass, 1) being a metal tube, constructed of sheet metal, and ofslightly taper or conical form, and secured to the upper ends of rods a,of which there may be three or more. These rods a are attached at theirlower ends to a metal ring or annular base, E, the interior diameter ofwhich is such that it may be titted on or over the burner B, and securedthereon by an y suitable means. A very good fastening may be obtained byhaving inclined surfaces a, one or more on the upper edge of the ring orbase, said inclined surfaces being under a pin or pins, 1), whichproject horizontally from the burner, so that by turning the chimney thering or base will be forced or pressed snugly down on the burner.

' Frepresen ts the glass portion of the chimney,

which may be of spherical, conical, cylindrical, or other proper form. Aspheroidal glass is represented in the drawing. The lower end of theglass F rests upon aflange, c, at the lower part of the ring or base E,the upper end encompassing the lower end of the tube D, but not beingattached to it in any way. The glass Fby this arrangement may be readilyraised so as to expose the wick of the lamp for lighting or trimmingwithout detaching the chimney from the burner or disturbing the metalportion of the former in any way. The glass is shown in an elevatedposition in red outline. Another advantage of the arrange ment is thatthe glass, being on the exterior of the metal frame, is allowed toexpand freely, and without coming in contact with any of the metal partsof the chimney. Hence it will be seen that all danger of breakage fromexpansion under the head of the frame is fully obviated.

A fruitful source of the breakage of lampchimneys consists in a screw inthe upper part of the burner, which, when the chimney is secured to theburner, is screwed inward over a flange at the bottom of the glass. Thisscrew being unyielding will be sure to cause the fracture of the glassif screwed at first snugly against the former. Spring-fastenings havebeen employed to obviate this difficulty, but they are liable to get outof order and become useless in a short time. In my invention it will beseen that no fastening is required at the lower end of the glass F, andhence the latter cannot be broken from that cause.

I am aware that metal frames have been used with a glass cylinder fittedwithin them to form lamp-chimneys; but so far as I am aware none havebeen devised with the glass portion fitted on the exterior of the metalframe to admit of the former being raised and lowered.

A great disadvantage attending the lastnamed chimneys consists in theglass portion being within the frame and necessarily restricted indiameter and brought quite in close proximity to the frame, therebyrendering the glass liable to breakage from that cause.

It will be seen that the rods a should be of sufficient length to admitof a glass, F, of proper length being used.

The advantage of the combined metal and glass chimneys consists in thesame not being liable to break in consequence of one part being heatedmore intensely than another. The entire glass chimneys break mostgenerally from that cause, as the upper narrow part heats much morerapidly than the lower part.

Besides this advantage which my invention possesses in common with theothers of the same kind, it possesses the advantage of not being liableto break from being restricted in expanding, and also possesses theadvantage of admitting the wick being readily exposed for trimming andlighting without removing the chimney from the burner.

I do not claim, broadly, a combined glass and metal lampchimney, nor achimney composed of a metal frame and a glass bulb, sphere, orcylinder,irres'pective of the arrangement herein shown and described butI do claim as new and desire to secure by Letters Patent A lamp-chimneycomposed of a metal frame formed of a tube, D, rods a, and a ring orbase, E, and a glass portion, F, fitted on the exterior of the metalframe in such a manner as to be capable of being raised and loweredthereon, substantially as set forth.

\Vitnesses: ALBERT ALBERTSON.

M. S. PARTRIDGE, Ron. II. LANDER.

